Epocrates and iPharmacy is a pill identifier app. Cargo Decoder is a HAZMAT Placard app that allows you to look up the placard and gives you everything the DOT Emergency Response Guidebook. All of these were free when I got them or had free apps available. The At-Scene app I still can not find

Check out this new Android/Iphone App called V.I.S. its a vehicle identification system. It's made for quick vehicle recognition especially for the hundreds of new models out there. It's only 0.99 cents. You can use it to interview victims too. It can confirm or rule out suspect vehicles.